Abstract
Brønsted acid sites inside the 0.3-nm-diameter cavities of pyrochlore antimony (V) oxide were detected with the use of pyridine as a probe molecule, and following the appearance of pyridinium ions by infrared spectroscopy (8a and 19b modes). The pyridine molecule is larger than the cavities' windows and can only bind acid sites when the oxide is strongly hydrated. This observation indicates that the protons are free to migrate to the surface.
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